“Going through pictures on my way to set,” he wrote. “From the early days. With Luke in the middle. Our heart, always. Tonight’s episode of #Riverdale finds Fred doing what he does best — helping Archie. It is dedicated to Luke, as all episodes will be for the rest of our run.”

“So heartbroken about Luke,” he wrote. “He was a father, brother, friend, and mentor. Each night before he had to shoot a scene, he’d call me and we’d talk about ... everything. I will miss those calls. And my heart goes out to all his family and friends.”

“I cannot individually respond to the hundreds of beautiful and heartfelt messages, but I see them, and appreciate you all for sending positivity to my family and I. I’m not really sure what to say or do in this situation, it’s something you aren’t ever given a lesson on how to handle, especially when it’s all happening in the public eye,” she wrote.